Studied permeable porous ceramics obtained by the selection of granular compositions filled with electrofusion corundum brands F600 (100-120 μm), F360 (40-60 μm) and F120 (10-20 μm). The reinforcing binders used as fine powders of corundum (about 2 μm) doped with 0,25 wt% MgO.; mixture of SiC powders (particle size 3-4 μm) and MgO (particle size 1-2 μm) in a ratio of 2:1. Burnable additives is used as ammonium bicarbonate (NH4)2CO3. Samples in the form of cross members 60x15x5,5 mm size was obtained by one-axial semidry pressing at the pressure of 100 MPa, which was fired in air at temperatures of 1450 to 1550 °C. The flexural strength of the sintered samples with burnable additives showed from 9,5 to 45,3 MPa, an open porosity of 35 to 55%. Samples promising for filter substrates and ceramic membranes.
porous permeable ceramics, electrofusion corundum, open porosity, burnable additives
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